1 // Copyright 2019 Google LLC.
2 // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
3 #include "tools/fiddle/examples.h"
4 // HASH=4486d0c0b22ad2931db130f42da4c80c
5 REG_FIDDLE(Canvas_accessTopRasterHandle, 256, 256, true, 0) {
DeleteCallback(void *,void * context)6 static void DeleteCallback(void*, void* context) {
7 delete (char*) context;
8 }
9 class CustomAllocator : public SkRasterHandleAllocator {
10 public:
allocHandle(const SkImageInfo & info,Rec * rec)11 bool allocHandle(const SkImageInfo& info, Rec* rec) override {
12 char* context = new char[4]{'s', 'k', 'i', 'a'};
13 rec->fReleaseProc = DeleteCallback;
14 rec->fReleaseCtx = context;
15 rec->fHandle = context;
16 rec->fPixels = context;
17 rec->fRowBytes = 4;
18 return true;
19 }
updateHandle(Handle handle,const SkMatrix & ctm,const SkIRect & clip_bounds)20 void updateHandle(Handle handle, const SkMatrix& ctm, const SkIRect& clip_bounds) override {
21 // apply canvas matrix and clip to custom environment
22 }
23 };
24
draw(SkCanvas * canvas)25 void draw(SkCanvas* canvas) {
26 const SkImageInfo info = SkImageInfo::MakeN32Premul(1, 1);
27 std::unique_ptr<SkCanvas> c2 =
28 SkRasterHandleAllocator::MakeCanvas(std::unique_ptr<CustomAllocator>(
29 new CustomAllocator()), info);
30 char* context = (char*) c2->accessTopRasterHandle();
31 SkDebugf("context = %.4s\n", context);
32 }
33 } // END FIDDLE
34